Database performance optimization

Relational databases are widely used in Internet projects. Today I will share with you several database optimization solutions:

1. Adjust the data structure the design of. This part is completed before developing the information system. Programmers need to consider whether to use the partitioning function of the ORACLE database and whether to create indexes for frequently accessed database tables.

2. Adjust the application structure design. This part is also completed before developing the information system. At this step, programmers need to consider what kind of architecture the application uses, whether to use the traditional Client/Server two-tier architecture or the Browser/Web/Database three-tier architecture. . Different application architectures require different database resources. (Recommended learning: MySQL video tutorial)

3. Optimize database SQL statements. Database SQL statement. The execution of the application will ultimately be attributed to the execution of SQL statements in the database, so the execution efficiency of SQL statements ultimately determines the performance of the ORACLE database. ORACLE recommends using the ORACLE statement optimizer (Oracle Optimizer) and row lock manager (row-level manager) to adjust and optimize SQL statements.

4. Adjust server memory allocation. Memory allocation is optimized and configured during the operation of the information system. The database administrator can adjust the size of the data buffer, log buffer and shared pool of the database system global area (SGA area) according to the database operating status; the program global area can also be adjusted. (PGA area) size. It should be noted that the bigger the SGA area, the better. If the SGA area is too large, it will occupy the memory used by the operating system and cause virtual memory page swapping, which will actually slow down the system.

5. Adjust hard disk I/O. This step is completed before the development of the information system. Database administrators can place data files that make up the same table space on different hard disks to achieve I/O load balancing between hard disks.

6. Adjust the operating system parameters. For example, for the ORACLE database running on the UNIX operating system, you can adjust the size of the UNIX data buffer pool, the memory size that each process can use, and other parameters.

Database is a warehouse that organizes, stores and manages data according to data structure. It was produced more than sixty years ago. With the development of information technology and market, especially in the 1990s, After the 1990s, data management is no longer just about storing and managing data, but has transformed into various data management methods that users need.

There are many types of databases, ranging from the simplest tables that store various data to large database systems that can store massive amounts of data. They are widely used in various aspects.

In the information society, fully and effectively managing and utilizing various information resources is a prerequisite for scientific research and decision-making management. Database technology is the core part of various information systems such as management information systems, office automation systems, and decision support systems. It is an important technical means for scientific research and decision-making management.

In the daily work of economic management, it is often necessary to put certain relevant data into such a "warehouse" and process it accordingly according to management needs.

For example:

The personnel department of an enterprise or public institution often requires the basic information of the employees of the unit (employee number, name, age, gender, place of origin, salary, Resumes, etc.) are stored in the table, and this table can be regarded as a database. With this "data warehouse", we can query the basic situation of an employee at any time as needed, and we can also query the number of employees whose wages are within a certain range, etc. If all these tasks can be automatically performed on computers, then our personnel management can reach an extremely high level. In addition, many such "databases" also need to be established in financial management, warehouse management, and production management, so that computers can be used to realize automated management of finance, warehouse, and production.

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